I hated my 42 when I first got it, once I worked out a cueing method, I realised it's a damn good mixer for the money.
"The only analogy I can think of it like when a new generation get into something, they look over their shoulders of their 'peers' and say, ah fuck you, it's our thing now... you know it happened with punk, it happened with acid house" - Nick Harris
What is this issue with cueing?? The db2 works exactly as the evo 4 does. What does Pioneer do differently? I owned a djm 400 and 909 but can't recall the cueing being any different?
I wouldn't consider moving from a DJM-700 to a Xone:92 an upgrade, it's more of a lateral move. Both are older mixers, and I'm not really a fan of either one.
If you're thinking of spending that kind of money on a mixer, you owe it to yourself to at least look at some of the newer stuff that's out there on the market. If you're into effects, there are great offerings from Denon, Ecler, Rane, and Vestax that may suit your needs.
As a final word of warning, beware of anyone trying to sell you on Xone mixers because of their sound quality or filters. With line-level signal, the sound quality is roughly the same as any other decent mixer, and the filters are middling at best. Personally, I find the resonance settings to be ridiculously low, and more absurdly, the lowest resonance setting isn't non-resonant, so the filters make noise even when the filter knob is turned all the way up/down (LPF/HPF.) On top of that, the filters make an audible "pop" on the outputs when engaged or disengaged.